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Main Sequence Multiple Populations in Large Magellanic Cloud Globular Clusters
14 novembre 2017 @ 11:45 - 12:45
Six Large Magellanic Cloud (LMC) globular clusters (GCs) (NGC 1466, NGC 1841, NGC 2210, NGC 2257, Hodge 11, and Reticulum) have been analyzed for multiple stellar populations with the Hubble Space Telescope (GO-14164). This is the first such study for ancient (ages > 13 Gyr) clusters in the LMC. We find that five out of the six GCs examined show evidence for multiple populations in the main sequence. One cluster (Hodge 11) shows irregularities in its horizontal branch that may indicate the presence of a 0.1 dex internal helium abundance spread.